First

Rehydrate the hide in some water w\salt and either use Enzol B or Rittel's Ultra soft. 2 pds of salt to a gallon of water will rehydrate the hide. After that you will have a raw hide and you will be able to tan it as usuall.

Relax R will work too

You can also use Knoblochs Relax R at a ratio of 1/2 oz per gallon of water in your rehydration bath, or the enzol B . You can tan it withPara Tan in you auto tanner, using 1oz of tan to each pound of skin, run in your tanner.